LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Sorry, I found the board on SHOPJIMMY.
Those wires should not be floating around like that, need to find which pins on the inverter connector they are connected to. Did any one else work on this TV before you?

Unfortunately Shopjimmy is located in Burnsville, Minnesota, United States and I am in Belfast, N.Ireland. I can't even gain access to the site due to my IP address.

No one else has worked on the set and there are 2 empty spaces in the connector. I just assumed that they were for perhaps for extra TV features which my TV didn't have. Also, I assumed that because when I hit the TV a sharp knock and it came on that those wires were unrelated. I'll try to get a clearer picture posted.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Hopefully image now attached

[vinceroger69]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

looking at the thread and picture i linked i think red should go to bri pin and black to err pin but please let budm comfirm after looking at both pictures as i dont want you damaging your boards but i have both pictures opened side by side and it looks like they go to those pins but i have no idea why they are not connected on your set.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

I do not believe it came from the factory with wires hanging out like that, someone must have worked on this TV before.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

It does look like Red goes to BRI, and the Black goes to the ERR pin.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Ok, will hopefully get them soldered on tonight if I can get some good lighting..

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Heated the soldering iron & then pulled connector off only to discover that I cannot solder directly onto pin as otherwise the connector would be permanent.

Instead I stripped back a few millimeters & soldered the end to give it rigidity, pushed it onto block of switched it on. Unfortunately, still nothing.

[vinceroger69]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

ok maybe take the power supply right out and trace the pin thats 3.4 volts that appears when you tap the set trace this pin (pin 7) on the back of the power supply it maygo to a regulator mounted on a heat sink etc that maybe dry jointed and may need touching up with fresh solder etc as you say it works when you tap the set etc

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

I've already done that a couple of times but it's too hard to trace the printed circuit back and I'm unable to find it. I resoldered a few connections around the area but it didn't help.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

I would solder to the pin on the bottom side of the board, then check the DCV on the BRI and on the ERROR pins to see what you have.

[stephenc]

SORTED Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Removed the board and soldered the 2 cables on the back as budm suggested; no difference at all and incidentally no voltage either.

Started playing about with board moving pins etc and noticed that one the big capacitors (shown in attached image) moved more freely than the rest. Removed the board again and wiggled it about only to find the pin moving through the solder. Got it soldered up and it's now working fine.

Thanks to all especially budm. I never would have sorted it myself.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Hmm, that cap is for the STBY power supply filter cap.
I think if you remove those two wires (BRI, ERROR) you will again not have backlights.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Lighting all appears to be working?

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Lighting all appears to be working?

I am still curious about those two wires which were not connected and like to know if you disconnect them you will get the backlights or not.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

I was very concerned about soldering them in but did so as you recommended, but when it made no difference I desoldered them, cut them clean & insulated the terminal ends.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

I was very concerned about soldering them in but did so as you recommended, but when it made no difference I desoldered them, cut them clean & insulated the terminal ends.

That is strange then that the BRI control pin is not used, and the Error output is not used (this one may not be needed if error signal is not required). Unless there is another pin for Dimming control that I do not see on the inverter board.
But if it works, leave them wires off then. Do you have the P/N for the inverter board?
Pictures of the power supply board I found at shopjimmy.
LG EAY33058501 (EAX3184520113, LGLP3237HEP) PS
Pictures provided by shopjimmy.